Lauertal Bridge

Coordinates: 50 ° 14 '53 "  N , 10 ° 12' 56"  E

Lauertal Bridge
Convicted	Federal motorway 71
Crossing of	Lurking
Subjugated	State Road 2282
place	Münnerstadt
construction	Prestressed concrete - box girder bridge
overall length	627 m
width	2 × 14.25 m
Longest span	87 m
Construction height	4.5 m
height	45 m
building-costs	16 million euros
start of building	2002
completion	2004
location

The Lauertalbrücke is a 627 m long bridge on the federal highway 71 . At 87 m, it has the largest span of all prestressed concrete girder bridges on the AB 71 and is the longest in the Bavarian section.

The bridge lies between the Münnerstadt and Maßbach junctions and crosses the Lauer valley near Münnerstadt. The state road S 2282 between Münnerstadt and Althausen as well as field and farm roads are spanned at a maximum height of 45 m with eight fields.

The motorway has a radius of 2250 m, starting at the north abutment for a length of 300 m, followed by a section with a clothoid (A = 1200). The bridge was built with two separate superstructures between 2002 and 2004 at a cost of around 16 million euros.

Foundation and substructures

The abutments and pillars of three axes are founded flat . With four axes, the pillars are founded on bored piles with a diameter of 0.88 m. The full cross-section of the pillars consists of a rectangle with rounded end faces at heights between 15 m and 40 m. The pier heads widen at the top to accommodate the bearings .

Superstructures

Box-girder cross-section of a prestressed concrete bridge

The two adjacent superstructures of the prestressed concrete bridge have the continuous beam as a structural system in the longitudinal direction . In the transverse direction there is a box cross-section with a constant construction height of 4.5 m in the central axis. The floor slab of the box girder is 6.0 m wide. The prestressing consists of a mixed construction with internal and external tendons .

The spans for the eight-span bridge are 64.5 m + 80.0 m + 82.0 m + 84.5 m + 84.5 m + 87.0 m + 80.0 m + 64.5 m.

execution

Lauertal Bridge

The bridge was built using the incremental launching method with 15 strokes with a maximum stroke length of 44.7 m. Because of the large spans, auxiliary piers were necessary in the middle of the field. These were slanting lattice towers made of steel, which were founded on piles. The last bridge span with a length of 64.5 m had to be pushed over without auxiliary supports due to the topography.

literature

• Autobahn Directorate North Bavaria: BAB A71 section Münnerstadt-Pfersdorf: Lauertalbrücke . brochure

Web links

Commons : Lauertalbrücke  - collection of images, videos and audio files

• Lauertal Bridge. In: Structurae
• Lauertal Bridge